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State police said a confidential source has offered to increase the current $5,000 reward in the Samantha Lang case to a total of $20,000 for a period of 90 days.

"The confidential source has acknowledged that, should additional information be obtained in this investigation based upon this increased reward money, the confidential source would extend the time frame of 90 days if there is credible and corroborating information provided to investigators that would further this investigation," police said in an email.

Lang, 22, was found dead in her home on Route 982 in Derry Township. Police said they believe she was killed sometime between 10 p.m. on March 26, 2007, and 9 p.m. on March 27, 2007.

Earlier this year, Lang's mother, Carol Polo, told WTAE that she's sure somebody knows something about what happened and she hopes that person will decide to come forward now.

"I can remember the whole day. I can tell you everything I did," said Lang's sister, Rachel Miller. "My life will never be the same."

Miller said the past five years without her baby sister have been very difficult. But she said the family remains confident that an arrest will be made, and they won't stop fighting for justice.

"Her killer thinks he's gotten away with it, you know? To him, my sister meant nothing, but to us, she was everything. You don't get to take somebody and then live life normally because my life will never be the same, so how dare you live normal," said Miller. "We are coming, and when we come, he is not going to know what hits him."

Anyone who has a tip about the case is asked to call state police in Greensburg at 724-832-3288. Anonymous calls will be accepted.